TextureStreamOut.h

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// Copyright Epic Games, Inc. All Rights Reserved.
 
/*=============================================================================
TextureStreamOut.h: Implement a generic texture stream out strategy.
=============================================================================*/
 
#pragma once
 
#include "CoreMinimal.h"
#include "RenderAssetUpdate.h"
#include "TextureMipAllocator.h"
 
class UTexture;
 
class FTextureStreamOut : public TRenderAssetUpdate<FTextureUpdateContext>
{
public:
 
    FTextureStreamOut(const UTexture* InTexture, FTextureMipAllocator* InMipAllocator);
    ~FTextureStreamOut();
    
    // Route FTextureMipAllocator::AllocateMips()
    void AllocateNewMips(const FContext& Context);
 
    // Route FTextureMipAllocator::UploadMips()
    void UploadNewMips(const FContext& Context);
    
    // Route FTextureMipAllocator::FinalizeMips()
    void FinalizeNewMips(const FContext& Context);
 
    // Execute the cancellation for both MipAllocator.
    void Cancel(const FContext& Context);
 
protected:
 
    TUniquePtr<FTextureMipAllocator> MipAllocator;
 
    FTextureUpdateSyncOptions SyncOptions;
 
    // The actual implementation of the update steps which redirect to FTextureMipAllocator and FTextureMipDataProvider.
    bool DoAllocateNewMips(const FContext& Context);
    bool DoUploadNewMips(const FContext& Context);
    bool DoFinalizeNewMips(const FContext& Context);
 
    EThreadType GetMipAllocatorThread(FTextureMipAllocator::ETickState TickState) const;
 
    EThreadType GetCancelThread() const;
 
private:
 
    // Whether FTextureMipAllocator::ETickThread is the same thread as EThreadType (as int32).
    FORCEINLINE static bool IsSameThread(FTextureMipAllocator::ETickThread TickThread, int32 TaskThread);
};